It's fine to me but do you really think ft and meters are necessary? Maybe ft makes sense but not meters because factor is 1,000.
952,898.22 miles
5,031,302,601.60 ft
1,533,541,032.97 meters
1,533,541.03 km
Theoretically, yard and inch might be added....
Dunno if "Preferred Units:" is perfect. Maybe just "Units:" because only one unit can or should be active at once.